Signaling system.



H. M. BASCOM.

SIGNALING SYSTEM.

APPLICATION FILED SEPT. 1. 1915.

1,21 1,044. Patented Jan. 2,1917.

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Henry 506 com,

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a plug l6, which releases the ciitoif storing this portion of the systemto itsfnors mal condition; If, however,'the A-operatoriingthe multiple'jacks 12 ofthe trunkhear this tone and understandthe condition 'of Thisin turn deenergizes the relay 23, re-

is'the first to disconnect, the cutoff relay .is .deenergized",-and uponthe closure of itsback contacts 28 and 29, the line relay is at onceenergized overthe trunk by'means" of'th'e circuit first traced.Before-*theslow release relay has time to release, as a result of theopening. ofcontact 133 of the cutoff relay which is in its originalcircuit,'-a locking circuit is completed for -it by contact 2320f theline relay and includingits contacts 35 and 36 and the secondary-windingof the transformer24. 2 Relay 23 therefore holds the cir-' cuit of-thelamp 20 open: in spite of the closure of the break at theifront contactof theline relay, sothatthe line's'ignal is not-again displayed. A:characteristictone potential" is impresseduponl the sleeve: contacts ofthe jacks zll iand' .12 by the interrupter 26* and the" primary oftransformer 24 through the secondary of u said transformer relay. con

tacts 86, 32 and 35, condenser 25'and conduc t0rt22. The central stationoperators test the trunk. Whenit; comes to the attention offthe privatebranch exchange operator 1 that she'hasfailed to disconnect, shewithdraws the plug 17 openingthe circuit of the line. relay 19; This bybreaking contact 32 I severe the locking ci'rcuitof relay 23, andthetrunk equipment is'a-gain normal I claim: q 1'. In-a telephone and aprivate branch exchange station, a trunk line extending between thestations,

connecting circuits for'cooperation with the trunk. at both stations, aline signal displayed when theiprivate branch exchange connectingcircuit is joined to the trunk,

means for causingthe Withdrawalof said signal upon the connectionof-the' central station circuit, with the trunk,'and means situated'atthe" central stationfor preventing the signal from beingagain displayedwhen the central station circuitvis disconnected from'the trunk beforethe disconnection'of the private branch exchange circuit.

2. The combination with a telephone line,

of a line relay, a signal controlled thereby, a cutofi relay, anda slowreleaserelay gov erned by the cutofirrelay for removing the w trunk'lineextending between the stations,

signal from the control of the line relay.

3. The combination with a telephone line,-

.of a 'line relay, a signal controlled thereby, a cutoff relay, a slowrelease relayfor disconnecting the sign'alfromthe line relay, an

energizingcircuit for the slow release relays including a front contactofvthe cutoff relay, and a locking circuit for the slow release relayextending through a front contactfof thelinerelay. v.; a

The ceinbiiiatio-n with a teleph o ne line,

of switching means for -connecting yvith and disconnecting iro opposite"extremitiesof' the line, and meansfor producing an audir I blesignalupon the line dependent upon the "disconnection of the switching meansina 7 particular order.

5LInfatelephone system, tWo' line'joiningthe stations and having aconductor local to astation, switching means cooperating with the lineatboth -stations;

and means-for'iproducing a signal upon the local conductor "of the lineat one "of the stations dependent;v upon the disconnection of theswitching means in a particular order.

6. I-na telephone system,two' stations,a

linejoining the stations and having a conductorfilocal to a station,switchin means;

of the stations upon-the disconnection of theg switching means at thatstation before the '7; In aftelephone disconnection ofthe switchingmeans at the" n, 7 1 system, a central station and a private branchexchange-station, a? trunk line extendingbetweenthe stations and.havingia "local conductor at the central station, connecting circuitsfor;-co6peration f w with'thetrunk at both stationsyandmeans I forproducing anaudible signal-upon saidj local conductor of the trunk"at-the central station upon the disconnection of the con- .7

= nectingcircuitat said station before discon f v nectionatthe privatebranch exchange. system, a central station find 8. The combination. witha telephone line,"

ofa line relay; a signal controlled thereby,

associated with the line by the slow release a relay:

a The assets with a ftieiihbaejiiae, i of switching means for connectingwith and i disconnecting from opposite extremities' of theline, a visualsignal associated-with: the.

- line, means governed bygthe line 1 switching I means forcausing the:displayof said signal, I

its operation upon-the order. of operation, of

: an audible signalfand means dependent for i I the line: switchingmeans for .renderingithefl visual signal:inefi'ective and forassociating the. audible signal with the'line.

10. In a telephonesystem, a central station and a private branchexchange Estation, a

connecting circuits for cooperation with'the trunk at. both stations, aline signal displayed ,when the 7 private branch :exchange T thesignalfrom being again displayed when the central station circuit isdisconnected from the trunk before the disconnection of the privatebranch exchange circuit, and means for producing in the trunk acondition indicating the character of the connection thereto.

11. The combination with a telephone line, of a line relay, a line lampcontrolled thereby, a cutofl' relay, a source of potential, and a relaygoverned by the cutoff relay for removing the line lamp from the controlof the line relay and for associating the source of potential with theline.

In testimony whereof, I have signed my name to this specification in thepresence of 15 two subscribing witnesses, this first day of September,1915.

HENRY M. BASCOM.

Witnesses:

ERNEST W. UNAUGST, J. WILLIS HINES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

